Fix canvas not always being redrawn on term resize

Paint implements its menu slightly differently to edit, in that it takes
control of the event loop until the menu is closed. This means that the
term_resize event is ignored, and so the canvas not redrawn when the
menu is open.

projects/core/src/main/resources/data/computercraft/lua/rom/programs/fun/advanced/paint.lua

@@ -275,6 +275,12 @@ local function drawCanvas()
     end
 end
 
+local function termResize()
+    w, h = term.getSize()
+    drawCanvas()
+    drawInterface()
+end
+
 local menu_choices = {
     Save = function()
         if bReadOnly then
@@ -376,6 +382,8 @@ local function accessMenu()
                 nMenuPosEnd = nMenuPosEnd + 1
                 nMenuPosStart = nMenuPosEnd
             end
+        elseif id == "term_resize" then
+            termResize()
         end
     end
 end
@@ -434,9 +442,7 @@ local function handleEvents()
                 drawInterface()
             end
         elseif id == "term_resize" then
-            w, h = term.getSize()
-            drawCanvas()
-            drawInterface()
+            termResize()
         end
     end
 end